By its very nature, a forum is made to have users who register and participate actively! If a forum has no users and many posts, it is a dead forum! I, who opened my first forum (still online) 20 years ago, know what an active forum means!
Then if there are admins who are content to have forums with 4/5 new threads a week and are convinced they have a good active forum, I am happy for them, they are just deluding themselves!
Since for you the number of posts and users is not important for a forum, why have you disabled the display of posts and members in yours? Perhaps to avoid showing that it is not very active? Why do people tend not to register and not participate in a forum that is not very active?